Concrete-filled square steel tubular column with built-in spiral stirrup

Abstract

The invention belongs to a building structure member in the technical field of building engineering, and particularly relates to a concrete-filled square steel tubular column with a built-in spiral stirrup. The concrete-filled square steel tubular column comprises a square steel tube, the spiral stirrup, a longitudinal reinforcement and core concrete, wherein the longitudinal reinforcement is arranged on the inner wall of the spiral stirrup to form a spiral reinforcement cage which is arranged in the center of the square steel tube, the core concrete is filled in the internal space of the square steel tube to form the concrete-filled steel tubular column with the built-in spiral stirrup. The concrete-filled steel tubular column with the built-in spiral stirrup has the advantages of being high in bearing capacity, good in ductility, excellent in anti-seismic property, simple in structure, simple and convenient to construct, and good in economy.

Description

technical field [0001] The invention belongs to building structural components in the technical field of building engineering, in particular to a square steel pipe concrete column with built-in spiral stirrups. Background technique [0002] Concrete-filled steel tube structure is a form of steel-concrete composite structure. It is made by filling concrete into steel tubes. It can effectively play the respective advantages of steel and concrete, and overcome the problem that steel tube structures are prone to local buckling. Disadvantages, it has the advantages of high bearing capacity, good seismic performance, significant economic benefits and quick construction. During the stress process of the concrete-filled steel tube column, the steel tube wall forms a rigid constraint on the core concrete. Both the steel tube and the concrete are in a three-dimensional stress state, and the compressive strength and plasticity of the concrete are greatly improved, preventing the core c...

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Problems solved by technology

However, since the square steel pipe section is composed of four straight sides, the restraint effect of the steel pipe on the core concrete at the same section is not uniform, the restraint is mainly concentrated in the four corners, and the restraint in the middle of the straight side is very weak. Therefore, the bearing capacity of the square steel pipe concrete The ductility is lower than that of circular concrete filled steel tubes with the same cross-sectional size, and the tube wall is prone to local buckling. Under the limitation of the width-to-thickness ratio of square steel tubes, making the steel tube wall thicker will increase the amount of steel used and increase the difficulty of welding

At present, it is mainly to prevent local buckling of steel plates and improve the restraint of steel pipes on core concrete by setting steel reinforcement ribs or steel plate stiffeners or using restraint tie rods. Disadvantages such as high cost, do not meet the actual requirements of the project

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